<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style>

        .warp{

            width: 900px;
            margin: 0 auto;

            text-align: center;
        }

        #header{

            height: 100px;
            background-color: #ff4b59;
        }

        #main{

            height: 500px;
            background-color: #B0B0B0;
        }

        #footer{

            height: 80px;
            background-color: #F4A283;
        }

        #left{

            height: 100%;

            width: 200px;

            float: left;
            background-color: blue;
        }

        #right{

            height: 100%;

            width: 200px;

            float: right;

            background-color: blue;
        }

        #middle{

            background-color: olivedrab;

            height: 100%;
        }




    </style>
</head>
<body>

<header id="header" class="warp">header</header>

<section id="main" class="warp">




    <aside id="left">left</aside>
    <aside id="right">right</aside>

    <section id="middle">middle</section>


</section>

<footer id="footer" class="warp">footer</footer>

</body>
</html>